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bq24780S Datasheet

1- to 4-Cell Hybrid Power Boost Mode Battery Charge Controller

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bq24780S
SLUSC27C – APRIL 2015 – REVISED MARCH 2017
bq24780S 1- to 4-Cell Hybrid Power Boost Mode Battery Charge Controller
With Power and Processor Hot Monitoring
1 Features
1 Industrial Innovative Charge Controller With
Hybrid Power Boost Mode
– Adapter and Battery Provides Power to
System Together for Intel® CPU Turbo Mode
– Ultra-Fast Transient Response of 150 µs to
Enter Boost Mode
– Hybrid Power Boost Mode from 4.5- to 24-V
System
– Charge 1- to 4-Cell Battery Pack from 4.5- to
24-V Adapter
• High Accuracy Power and Current Monitoring for
CPU Throttling
– Comprehensive PROCHOT Profile
– ± 2% Current Monitor Accuracy
– ± 5% System Power Monitor Accuracy
(PMON)
• Automatic NMOS Power Source Selection from
Adapter or Battery
– ACFET Fast Turn on in 100 µs
• Programmable Input Current, Charge Voltage,
Charge and Discharge Current Limit
– ±0.4% Charge Voltage (16-mV step)
– ±2% Input Current (128-mA/step)
– ±2% Charge Current (64-mA/step)
– ±2% Discharge Current (512-mA/step)
• High Integration
– Battery LEARN Function
– Battery Present Monitor
– Boost Mode Indicator
– Loop Compensation
– BTST Diode
• Enhanced Safety Features for Overvoltage
Protection, Overcurrent Protection, Battery,
Inductor, and MOSFET Short-Circuit Protection
• Switching Frequency: 600 kHz, 800 kHz, and
1 MHz
• Realtime System Control on ILIM Pin to Limit
Charge and Discharge Current
• 0.65 mA Adapter Standby Quiescent Current for
Energy Star
2 Applications
• Notebook, Ultrabook, Detachable, and Tablet PC
• Handheld Terminal
• Industrial and Medical Equipment
• Portable Equipment
3 Description
The bq24780S device is a high-efficiency,
synchronous battery charger, offering low component
count for space-constrained, multi-chemistry battery
charging applications.
The bq24780S device supports hybrid power boost
mode (previously called "turbo boost mode"). It allows
battery discharge energy to system when system
power demand is temporarily higher than adapter
maximum power level. Therefore, adapter does not
crash.
The bq24780S device uses two charge pumps to
separately drive N-channel MOSFETs (ACFET,
RBFET, and BATFET) for automatic system power
source selection.
Through SMBus, system power management
microcontroller programs input current, charge
current, discharge current, and charge voltage DACs
with high regulation accuracies.
The bq24780S device monitors adapter current
(IADP), battery discharge current (IDCHG), and
system power (PMON) for host to throttle back CPU
speed or reduce system power when needed.
The bq24780S device charges 1-, 2-, 3-, or 4-series
Li+ cells.
Device Information(1)
PART NUMBER
PACKAGE
bq24780S
WQFN (28)
BODY SIZE (NOM)
4.00 × 4.00 mm2
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Adapter
4.5-24V
N-FET Driver
RAC Enhanced Safety:
OCP, OVP, FET Short
Adapter Detection
bq24780S
SMBus Controls V & I
with high accuracy
SMBus
Hybrid Power
Boost Charge
Controller
SYS
N-FET Driver
Battery
Pack
RSR 1S-4S
HOST
IADP, PROCHOT,
PMON, IDCHG
Integration:
Loop Compensation; Soft-Start
Comparator, BTST Diode
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

bq24780S Datasheet Preview

bq24780S Datasheet

1- to 4-Cell Hybrid Power Boost Mode Battery Charge Controller

No Preview Available !

bq24780S
SLUSC27C – APRIL 2015 – REVISED MARCH 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Timing Requirements .............................................. 11
6.7 Typical Characteristics ............................................ 13
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 15
7.3 Feature Description................................................. 16
7.4 Device Functional Modes........................................ 22
7.5 Programming........................................................... 23
7.6 Register Maps ......................................................... 25
8 Application and Implementation ........................ 36
8.1 Application Information............................................ 36
8.2 Typical Applications ................................................ 36
9 Power Supply Recommendations...................... 44
10 Layout................................................................... 44
10.1 Layout Guidelines ................................................. 44
10.2 Layout Examples................................................... 45
11 Device and Documentation Support ................. 48
11.1 Receiving Notification of Documentation Updates 48
11.2 Community Resources.......................................... 48
11.3 Trademarks ........................................................... 48
11.4 Electrostatic Discharge Caution ............................ 48
11.5 Glossary ................................................................ 48
12 Mechanical, Packaging, and Orderable
Information ........................................................... 48
4 Revision History
Changes from Revision B (April 2015) to Revision C
Page
• Full data sheet to product folder............................................................................................................................................. 1
Changes from Revision A (April 2015) to Revision B
Page
• Changed the Description for pin 22 (GND) in the Pin Functions table................................................................................... 4
• Changed the Thermal Pad to PowerPAD in the Pin Functions table..................................................................................... 4
• Changed 16X to 20X on the SRP and SRN pins of the Functional Block Diagram ............................................................ 15
• Changed C4 From: 0.01 μF To: 0.1 μF in Figure 17 ........................................................................................................... 36
Changes from Original (April 2015) to Revision A
Page
• Changed V(ACOC) in the Electrical Characteristics, MIN From: 190% To: 180%, MAX From: 215% To: 220% ..................... 9
• Changed "ChargeOption() bit [0] = 0" To: REG0x12[0] in Enable and Disable Charging.................................................... 17
• Changed " (REG0x12[1])" To: (REG0x12[0]=1) in Enable and Disable Charging ............................................................... 17
• Changed " REG0x12" To: "REG0x12[0]" in Battery Charging ............................................................................................ 22
• Changed Bit [10:9] in Table 9 From: 11: 8 ms To: 11: 800 µs ............................................................................................ 30
• Added sentence to Bit [7:6] in Table 9 " If REG0x15() is programmed..." ........................................................................... 30
• Changed text in Bit [5] of Table 9 From: "write 0x3C[2] = 1." To: "write 0x3C[2] = 0." ........................................................ 30
• Deleted text from Bit [5] of Table 9 "This function is not available in 1s battery."................................................................ 30
2 Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated


Part Number bq24780S
Description 1- to 4-Cell Hybrid Power Boost Mode Battery Charge Controller
Maker etcTI
Total Page 30 Pages
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